HST File Naming Convention

HST IPPPSSOOT File Name

HST data use the 'ipppssoot' file naming convention. Each letter is mapped as follows:

i : instrument identifier, will be one of:

E = Engineering data,

F = Fine Guidance Sensors (FGS),

I = Wide Field Camera 3 (WFP3),

J = Advanced Camera for Surveys (ACS),

L = Cosmic Origins Spectrograph (COS),

N = Near Infrared Camera and Multi-Object Spectrograph (NICMOS),

O = Space Telescope Imaging Spectrograph (STIS),

S = Engineering subset data,

T = Guide Star position data,

U = Wide Field/Planetary Camera-2 (WFPC2),

V = High Speed Photometer (HSP),

W = Wide Field/Planetary Camera (WFPC),

X = Faint Object Camera (FOC),

Y = Faint Object Spectrograph (FOS),

Z = Goddard High Resolution Spectrograph (HRS)

ppp : Program ID; can be any combination of 3 letters or numbers. There is a unique association between program ID and proposal ID (generally equivalent to the 5-digit HST phase-2 ID),

ss : Observation set ID (generally equivalent to the HST phase-2 visit number); any combination of 2 letters or numbers.

oo : Observation ID (generally unique for each exposure); any combination of 2 letters or numbers.

t : Source of transmission or association product number, one of the following letters or numbers 0-8:

B = "B-associations" generated by CADC and ST-ECF for WFPC2,

M = Merged real time and tape recorded,

N = Retransmitted merged real time and tape recorded,

O = Retransmitted real time (letter 'O’),

P = Retransmitted tape recorded,

Q = Solid-state recorder

R = Real time (not recorded),

S = Retransmitted solid-state recorder,

T = Tape recorded,

0 = Primary association product (number zero),

1-8 = ACS, COS, NICMOS, or WFC3 association sub-product

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HST Data Suffix

HST data use a number of suffix rules after the 'ipppssoot' name.

Uncalibrated:

Suffix	Description	Used with the following Instrument(s)
_raw	Raw data	WFC3, ACS, NICMOS, STIS
_tag	Raw timetag data	STIS
_lrc	Local rate check image (BOP)	STIS
_wav	Wavecal	STIS
_wsp	Wavecal support file	STIS
_asn	Association file	WFC3, ACS, COS, NICMOS, STIS
_spt	Telescope, telemetry, engineering	WFC3, ACS, COS, NICMOS, STIS
_trl	Trailer, processing log	WFC3, ACS, COS, NICMOS, STIS
_rawacq	Raw data	COS
.d0h/.d0d	Science data image	FOS, GHRS, WFPC1, WFPC2, FOC
.q0h/.q0d	Science data quality	FOS, GHRS, WFPC1, WFPC2, FOC

Calibrated:

Suffix	Description	Used with the following Instrument(s)
_flt	Calibrated, flat-fielded exposure	WFC3, ACS, STIS
_crj	Calibrated, CR-rejected, combined	WFC3, ACS, STIS/CCD
_drz	Calibrated, geometrically-corrected, dither-combined	WFC3 ACS
_fltsum	Calibrated, flat-field for images	COS
_x1dsum	Calibrated, combined 1D extracted for spectra	COS
_x1d	Calibrated 1D spectra from exposures	STIS
_x2d	Calibrated 2Dspectra/images from exposures	STIS
_sx1	Calibrated 1D spectra from combined exposures	STIS
_sx2	Calibrated 2D spectra/images from combined exposures	STIS
_cal	Calibrated exposure	NICMOS
_mos	Calibrated, combined image	NICMOS
_sfl	Summed, flat-fields image	STIS/MAMA
.c0h/.c0d	Calibrated wavelengths	FOS, GHRS
.c1h/.c1d	Calibrated fluxes	FOS, GHRS
.cqh/cqd	Calibrated science data quality	FOS, GHRS
.c0h/.c0d	Calibrated science data	WFPC1, WFPC2, FOC
.q0h/.q0d	Calibrated science data quality	WFPC1, WFPC2, FOC

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Example:

Dataset name, F05Q7407M, where 'ipppssoot' is mapped as follows:

i=F (FGS)

ppp=05Q

ss=74

oo=07

t=M (Merged)

Additional examples and information can be found in the HST Handbook and here.